The YKK Group(YKKグループ,Waikeikei Gurūpu?) is a Japanese group of manufacturing companies. As the world's largest zipper manufacturer, YKK Group is most famous for making zippers. However it also manufactures other fastening products, architectural products, and industrial machinery.

YKK claims to be the first zipper company to promote environmental protection measures. YKK developed a line of "environmentally friendly zippers", following the company's philosophy "The Cycle of Goodness" which means that one prospers when the person renders benefit to others.